Shutter



T.OHNO

June 4, 1929.

SHUTTER Filed se t.'29. 192s 3 Sheets-Sheet 1 June 4, 1929- I 1'. OHNO 1,715,424

SHUTTER Filed Sept. 29. 1926 5 Sheets-Sheet 2 FIG. 6.-

f 19. 4. 4 H5 {7 26 5 I xfi wzl 2.

29 23 1' P 5 I, 1 i 1 Z 57 i 03 A T1 52 61 m r 1 n far June 4, 1929. T. OHNO 1,715,424

SHUTTER I Filed Sept. 29. 1926 3 Sheets-Sheet 3 .Ffra. 7.

Patented June, 4, 1929.

- I TADASHIHOHNO; or HoiNeoKfi, manque seamen;

eppiica ien' fiied js'epte'mber'zs, 1926.- serial ml'ises'se;

My invehtio'n relates to improvements in a, shiitter of the type in which shits are sueces v siyely 'fasteiied together to form a'fiexible' door 01' curtain Which s dlle'd eq'n a shatt I when opened, comp'i'isiiiga'centrifugal 'governor geared to the'eu'rtain, means for auto f inatically releasing the ci'n tain by the fusion of a fusible metal in an emergency, and means 7 for: manually teleitsiiig the cuttaiii.

The principal object of theeinventie'n isto regulate the downward c'losing'ifievmnf of the curtail y 11h23 p id of a centrifugal overnor so thatfany dapger mzty be eve'i'cied' and so that the cumin and the contrelhhgmechanism Ditty be rendered safe and diiifable.

' Another object of the invention is to 'ztii't0 maticailyvclose the curtain in the event offife by means of afusibie fei iiiing apart of the eutenmtic releasing device, Anothei' object of thei'nventloii is te provide a eon- 1 trolling device adapted to be operated intlef pendently either automatically 0i manually.

Further objects of the'i ventio n Will appear in the course of the present specification,

The accompanying drawing shows enihodi'n'ient of the present invention; in Which:

'Fig.1 is

in eie'vati'onal view of theini [proved shutter as seen from insider v h Fig. 21s a verticaitransverse 'sectio i'al view of the arrangement shown 1'11 F g. 1-.

,Fi .,3 i an enlarged side eleyzttion'al view of the housing \Vith'the front wall removed.

I 1g. 4 is a. sectional side elevatibrio f 3.

Fig. 5 is a sectional elefvati'dh of the ce g ti-ifuga'l governorbn'an enlarged scale v Fig. 6 is a fi'egniehtzi y side ei'eyati'o'n'z'il View looking oi t'yvzt'fdly fiibihfthe 'of the housing, showing the' fac'c'e'ss opening ztiid its covers. h g Figs; 7 to are d'etailedyiew's of the mito- 'Ihatie releasing 'devicel I 1 i f F igs. 11 ai'id l2taie detttiledwi'ety slef the handle'with safety pin.

" Same r f 1=ence ch m tr designme {the s'ztme part thro igi'ioiit the views O'f'the di aW Referring firstly to Figs. 1 a'ndfQ, tepresents a frame of the xyifndo'w '0? opening to Whichtheshi tter is "attached." ('2)" (2) are phamielsof r ves arrangedht ho'th side's .Qf. the frame (1); is a shutter" h'OxJarme -ed atthe' pper side of the frame'ii),

(4) is a flexible door of curtztin' coiiipos'edefv a 'plui ality of arrow steel slats sucees'siy'ely fastened togethei airangefd in the (than (2) (5) t is -amain shaft afrahged nels (2) in the shutter hOX fer 'sfup'perting the cuftaiii. are'ba'rrels fixed On-the shaft (5) [and to' which oneendof thecurtain is 'conneeted sothat it ii'my be felled substan tially coi'icei tric'ally thereon or unrolle'd therefrom depending jo'n the direction of ro cation of theshaft (5). -;(7 is a rope drum fixed at the en d 6f the shaft (5). (8) is a rope wound on the drum. ('9)' i's a giiid'e pulley for the-rope (8);; (10) is ahousing; arranged at the lower p'attof thefr'ztine 1 In orderto control the-operation of the cur. v

tain controlling mechanism is arranged Withthe hoiisiiig (10) and is'a'dapt'e'cl to be 0per v at'ed ,ziiitom'zttic'allyi" or" manually.- As shown.

iiiFigs. send-4, a shaft 11y, provided With c a" drum (12), upoiiwhich the other en'd'ofefcre'said. rope-(8) is weuntt, is arranged at the lower part Of the heusing (10).

ii'ieshes with :t'gear (15) -fi xed' jon the-shaft A ratchet Wheel*( 16) fixed oil the shaft ('14) and is eiigaged by it paw'1 (19) piv= ote'das at ,(17), Whereby the curtain is pfe vezi't'ed frem bein -unrolled by its bWIl Weight.

fixed on it shaft (21.) a1rtt'nged et theupper part of the hoiisiiig 1O'.)Ysb'thatlthe'foteiting' speed fof the shaft (21)"iseensiderab1y ih- Said, shaft (11) is rovided with a ear (13) which V Th'esheft (14)'-isfurther provided with-a I" gear which mesheswithfa -gegtr (-22) '5 as shown-in Figs; 3am 4,1;md a c1b1laf 325) providedetboth endswitlidisks(24c) isfixed on theshaft wi'thiti'th'e ca's'i'rig Thefc'ollar (25) is"alsojpfovidedflwithiadial tatesat'o ahe've a pifedete'rminedfs'peed the" iiiasses (27) inove outwardly-under the ac tioh 'of centrifugal force and frictienaliy eiig'ztge the inner periphery of the casing (23); 1

6 When the pztwl 1'9) is c isehga-ged'fromthe and 'theeiirt'iiii Myst-arts -iin'i*ollingewing to gravity endthe Weight ofthe euter hanging ratchet Wheel (16), thesham i is released action or movement. The curtain being made slat or slats, causing the shaft tovbe r0 tated andthe rope (8) to be-woundonthe drum (7) and unwound from the drum'(12) in the housing (10). As the curtain (4) de scendsin the channels" or grooves (2); the weight of the unroll'ed part increases and correspondingly increases the speed of closing of steel slats the weight is considerable. Therefora if the curtain is left tobe freely unro1led,,the1 speed may become suflieient to endanger thosepassing underit, or irreparably-damage the'curtain or the mechanisms when the lowermost slat strikes the sill.. The

centrifugal governor according to the present.

invention is provided .toregulate such undesirable speed of the descending curtain. When the drum- (12) is rotated by the unrolling of the curtain the shaft (11) rotates in the housing (10) and the speed is augmented bythe gear trains (13)-'(15') (20), (22) so thattheshaft ('21) is quickly rotated and by-the centrifugal force induced the masses (27)-m ove radially against the springs and slidably and frictionally engage the 1I1- ner periphery of the casing toconsequently retard the rotation of" the shaft (21) The radial pressure of the masses (2'?) on .the casing (23) and thefriction caused'thereby Heretofore it has been proposed to retard V the closing movement of the vcurtain by other means, but the present invention includes'the appl icationgof a centrifugal governor whereby the regulation maybe accomplished more I effectively. uTheha'nging end ofthe curtain I when closed is comparatively'slight in com parison with the entire length of the' curtain andthe descending speed of. the curtain at the initial-closingmovement is apt to be rather $1OW'. Accordingtothe presentinventionthe moving masses of th'ecentrifugal governor are provided with thesprings which I force the former toward'the centre of the casing so that they will not comeinconta'ct with the casing before thecurtain reac'h'esa predetermined speed so that the curtain is never retarded at the beginning of its closing]: movement;-

The device for automatically closing the curtain inan emergency is operated by afusible pinarranged atthe lo'werside of the shutter box (3) or any other.convenientplace.

' of said plug which projects below the shutter box (3) is apertured at ('32) and a pin (33),. p

".made'jofa fusible metal, is passed through it j 5 An example of said ,fusible'pinis shown in Figs. 7 to 10. An aperture (30) is formed at the bottom of the-shutter box and aplug (31) .isfreely passedtherein; The lower part to prevent the plug being pulled upwardly and released; Within the boxf(3) the {plug (31) passes through the slot (36) formed at one end of a lever fulcrumed at (34),

and is provided at its other endwith a washer 37) and a nut (38). At the other end of 1 saidjl'ever (35) there is arranged an arm- (40) fulcrumed at (39) and having at the lower side a (41 which abuts at the end of the lever (35)to prevent the-arm (40) fr'om'tur'nj ing downwardly. A lever (44) is fulcrumed on a verticals indle (43) provided with a spiral spring 45) which acts on said lever durlng its horizontalswingmg movement on the guide (51). One endofthe lever (44) is set to bear against the projection (42) formed on the upper. side ofthe arm-(40) while the other end has attached thereto one end vof a cord (46) which passes over a guide pulley (47) (see Fig. 1) and has its other end con nected to an arm (49) pivoted at ('48) in the housing (10).. This arm (49) has a project 'ing portion (50); which extends beneath the pivoted pawl (19) when the latter is in engagement with [the ratchetwhe'el (16), as shown in Figs3and 4. i

I In thestateddevice the plug (31) being held by the fusible, pin the lever and the arm (40) keep the position as shown in Fig. 8, and the lever (44) is heldfbythe projection (42). No'winan emergency when the" fusible pin (33) melts the plug (31). is. freed as shown in broken lines in Fig. 9. The lever (44);-presses'th e projection (42) under 'the action of-the spring (45), sothatwhen the plug (31) is freed the lever- (35') and the I arm (40) move asshown in Fig. 9,'wh'ereby' the cord (46) is lifted and the arm (49) (see I Fig. 3) moves upwardly causing theprQ ect- I ing-portion (50) to disengagethe pawl (19) fronithe ratchet wheelf(16).l The shaft (14) After the curtain has been again opened and the fusible pin replaced as shown'in 1 Fig. 8,thelever (44) isreset. The projection (42) isf'plulled by the lever (44) and the arm 40) moves as shown in broken lines Fig. 8, and thelever (44). is again supported at the projection (42) as shown in the same figure.

Thedevice for: manually releasing the Figs. 3 and 4, a circular opening (52) pro vided in the front wall fof the housingj(10). i The opening (52) vis provided with a fc ov'er (52) carried'by'a pivotpin (53') which is extended inside the housing (10) andprovided witha cam (54) corresponding to a projectis, now. releasedfand the curtain is unrolled.;

, ratchet wheel (16) comprises, :as shown in ing edge (55) formed at the side of the arm I (18). The pivot (53) 'is further provided with a Icam (56) engaging a roller (57) arranged'on an arm (59) which latter is pivoted at (58) and provided at the other'end with a spiral; spring (60) to keep the cover (52) in osition, I I i I hen the cover (52) 1s swung upwardly the pivot rotates and the cam (54) presses the projecting edge (55) of the arm (18) so thatthe pawl (19) is released from the ratchet wheel (16). Therefore if the cover (52) is opened while the curtain is raised or rolled up the latter begins its closon the ratchet wheel (16) to keep the curtain from being unrolled. Thus the automatic device and the manual device can be operated for releasing the curtain without affecting each other, according to the present invention.

A preferred-form of handle for manually rolling the curtain is shown in Figs. 11 and v 12. The handle lever (63) is provided at one end with a crank handle (62) and at the other end with a clutch (64) having jaws (65) which are adapted to be engaged with a clutch (61) formed at the adjacent end of the shaft (14) whereby the latter may be rotated only in onedirection. In the shutter I of the type described the curtain may occasionally be obstructed at the channel or toe rope may be irregularly wound on the drumso that the rolling ofthe curtain is hindered.

V In order to avoid injury to the curtain caused,

for instance, by turning thehandle beyond a predetermined extent, the clutch (64) is fitted on a pivot (66) formed at the end of the handle lever (63) and is fixed thereto by a copper pin (67). The clutch (64) is turned within the shearing'strength of said pin (67) and any damage which may occur by turning with a base (68) which is fixed at the side the handle by force, is avoided by'the breakage of 'said pin. The pin (67 is provided of the clutch (64) by a screw (69)'.' The inner end of the screw .(69) is fitted in a groove (70)-formed around the pivot' (66) and in case the pin (67) is broken the clutch (64) is prevented from becoming disconnected from the pivot (66). r

' Having thus fully described the invention,

what is claimedand desired to be secured by Letters Patent is f a v l. A shutter of the character described,-in-

eluding in'combination a gravity operated flexible curtain, a winding drum therefor, a centrifugal governor, gearing between the governor and the drum, latching means in" operable relation with the gearing means and the drum for releasably holding the curtain in a raised position, an automatic releasing device operably connected with the latching meansv for releasing the winding drum to permit lowering of the curtain and including a spring pressed lever, a flexible element be.- tween the lever and the latching means, cooperative catch members associated with the spring pressed lever, and locking means ineluding a fusible pin normally holding the V catch members in the .path of the, spring pressed lever.

2. .A shutter as claimed in claim 1, wherein the centrifugal governor includes a casg mg, a rotableboss, mass'es'connected to the boss and adapted for radial movement with respect to the boss during the rotation thereof, and spring means for yieldingly holding the masses against the boss at the initial ro tation thereof but permitting of the massesto frictionally engage the casing to prevent the lowering of the curtain beyond the predetermined speed. .7 l

3. A shutter as claimed in claim 1, wherein manually operable means is also provided for releasing the drum,said means including a plvoted arm, a cam on the arm in operative relation to the latching means for releasing said latching means, and ahandle lever-for rotating thegearing between'the governor and the drum, substantially as and for/the purposes set forth." I

' V Intesti'mony' whereof I have affixed signature. v r I a r TADASHLOHNO, 

